1730 クローズド形一枚羽根遠心羽根車のポンプ性能に及ぼす比速度の影響(S19-6 流体機械に関連した流動現象とその解析・計測(6)流体機械の性能と内部流れ,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

抄録

For the centrifugal pump applying to sewage water containing foreign bodies, higher pump efficiency and non-clogging characteristic are required. In order to improve its performance, authors have developed new type impeller. In these pumps, the ratio of blade width to the impeller diameter (b_2/D_2) varies in each impeller, since the passage diameter (called minimum particle diameter) inside the impeller depends on the discharge pipe diameter. This yields different specific speed in each pump. Therefore, it is very important in the design of these pumps to understand the effect of specific speed on the pump performance. In this investigation, experiments were conducted on the several impellers with the specific speed in range of 248-343 (m, m^3/min, min^<-1>). As a result, it was found that pump efficiency deterioration within the range of specific speed is less than 5%.